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Explain alternative signatures of @IBAction #7

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Explain alternative signatures of @IBAction #7

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6bb95cb
Introduce the id type equivalent
gabrielf Jan 29, 2015
0842de9
Explain different @IBAction signatures
gabrielf Feb 12, 2015
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10 changes: 10 additions & 0 deletions content/ibaction-and-iboutlet.md
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Expand Up @@ -21,13 +21,23 @@ And then you constantly have to dig into your .h file when playing with storyboa

Simplicity rules in swift. If you have a property defined that you want to make accessible to your storyboards, just add the `@IBOutlet` attribute before your property. Similarly with `@IBAction` to connect storyboard actions back to code.

The sender argument is optional. If you need it, and you know the sender's type, then specify it in the method signature. If you need the sender but it can be of different types you use `AnyObject`, which is the equivalent to the `id` type in Objective-C. For the cases where the sender is not interesting, just leave it out.

{{% prism swift %}}class MyViewController: UIViewController {
@IBOutlet weak var likeButton: UIButton?
@IBOutlet weak var instruction: UILabel?

@IBAction func likedThis(sender: UIButton) {
...
}

@IBAction func sendersTypeDoesntMatter(sender: AnyObject) {
...
}

@IBAction func dontNeedSender() {
...
}
}
{{% /prism %}}

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